|Name|Gauge|Builder|Type|Date|Works number|Notes|
|---|---|---|---|---|---|---|
|No.774|2 ft (610 mm)|Baguley|4wPM|1919|774|Undergoing restoration, not on display, purchased 1998|
|Dot|18 in (457 mm)|Beyer Peacock|0-4-0WT|1887|2817|Built for the internal Gorton locomotive works of Beyer Peacock. Donated to the Museum in 1961.|
|Rough Pup|2 ft (610 mm)|Hunslet|0-4-0ST|1891|541|Built for the Dinorwic Quarry railway. Preserved as withdrawn from service, in the Museum since 1964.|
|No. 13|1 ft 10 in (560 mm)|William Spence Ltd.|0-4-0T|1895||One of a fleet of overtype locomotives built for the Guinness St. James's Gate Brewery in Dublin and the first loco donated to the Museum, in 1956.|
|George Henry|1 ft 10 3⁄4 in (578 mm)|De Winton|0-4-0VB|1877||ex-Penrhyn Quarry locomotive. Donated to the Museum in 1964|
|Jubilee 1897|1 ft 11 1⁄2 in (597 mm)|Manning Wardle|0-4-0ST|1897|1382|Built for the Cilgwyn Quarry in the Nantlle Valley. Sold to the Penrhyn Quarry in 1928; withdrawn 1955. Donated to the Museum in 1963|
|Dundee Gasworks No.2|1 ft 11 1⁄2 in (597 mm)|Kerr Stuart|0-4-0WT|1907|720|Built for the Dundee gasworks railway. Acquired by the Museum in 1961. Major restoration work was carried out in 2004|

Question: how many locomotives are on display at the narrow gauge railway museum?
Answer: 7